Andrew
Andrew asked Lois McMaster Bujold:

Heard about this real-life soletta in the Italian Alps?http://news.bbc.co.uk/2/hi/europe/6189371.stm

Lois McMaster Bujold
I hadn't, but I have heard of similar things. Going right back to pre-electric days exploring, and possibly building, Egyptian tombs using mirror-light.

Ta, L.

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